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Jeremejevite from Ameib Ranch, Arandis, Erongo Region, Namibia. Etched, gem quality blue crystal with attached Tourmaline paired with a huge 4.48 carat custom cut stone with a good blue coloration. Cut stone is 2cm long. Retail value of the gemstone is $800 per carat ($3,584).
Dom Pedro, the World's Biggest Aquamarine Gem. The obelisk-shaped, blue-green gem, which was designed by famed German gem cutter Bernd Munsteiner, known as the "father of the fantasy cut," stands 14 inches (35.5 centimeters) tall and weighs 10,363 carats, or 4.6 pounds (two kilograms). (Link)